Intranasal delivery of compounds that reduce intrancranial pressure

ABSTRACT

Increasing intranasal lymphatic circulation as a means of decreasing intracranial pressure in traumatic brain injury.

BACKGROUND OF THE INVENTION

According to Vink, Exp. Op. Invest. Drugs, October 2002, 11(1) 1375-86, and Vink, Exp. Op. Invest. Drugs, (2004) 13(10) 1263-74, “traumatic brain injury (TBI) is one of the leading causes of death and disability in the industrialized world and remains a major health problem with serious socioeconomic consequences. In industrialized countries, the mean incidence of traumatic brain injury (TBI) that results in a hospital presentation is 250 per 100,000. In Europe and North America alone, this translates to more than 2 million TBI presentations annually. Approximately 25% of these presentations are admitted for hospitalization. Those individuals who survive TBI are often left with permanent neurological deficits, which adversely affect the quality of life and as a result, the social and economic cost of TBI is substantial. Despite the significance of these figures, there is no single interventional pharmacotherapy that has shown efficacy in the treatment of clinical TBI.”

It is well known that TBI causes edema in the brain, thereby elevating intrancranial pressure (ICP). Unterberg, Neuroscience, 129, 2004, 1021-1029. According to Bhardwaj, Stroke, 2000, 31, 1694-1701, intravenous administration of osmotic agents susch as mannitol and hypertonic saline have potent anti-edema action, presumably by drawing water from interstitial and intracellular spaces into the intravascular compartment. However, the use of such agents remains controversial. For example, the long term beneficial effects of mannitol remain unknown. There is some evidence that repeated doses of mannitol may even aggravate brain edema. Lastly, mannitol fails to be effective in some patients, even after repeated doses. Schwarz, Stroke, 2002, 33, 136-140.

SUMMARY OF THE INVENTION

It is an object of the present invention to provide an alternative means for reducing intracranial pressure, in head injury or other states when intracranial pressure (ICP) is elevated, without the use of intravenous mannitol or hypertonic saline.

The present inventors have noted that a substantial fraction of intrancranial CSF is drained through the cribriform plate located at the top of the nasal cavity. Koh, Cerebrospinal Fluid Research, 2005, 2, 6 (2005) suggests the possibility that CSF may drain into extracranial lymphatic vessels in significant volumes. Koh further states that CSF mainly flows along the extensions of the subarachnoid compartment associated primarily with olfactory nerves, convects through the cribriform plate and is ultimately absorbed by the lymphatic tissue in the nasal mucosa.

It has further been reported that CSF is removed from the cranium by transport through the cribriform plate in associated with the olfactory nerves, and is then absorbed into lymphatics located in the submucosa of the olfactory epithelium (olfactory turbinates). Nagra, “Quantification of cerebrospinal fluid transport across the cribriform plate into lymphatics of rats”, Am. J. Physiol. Regul. Integr. Comp. Physiol. 2006 Jun. 22 (e-pub).

It has further been reported that lymphatics encircle the olfactory nerve trunks on the extracranial surface of the cribriform plate and absorb CSF. Koh, “Development of cerebrospinal fluid absorption sites in the pig and rat”, Anat. Embryol (Berl), 2006 Mar. 10 (e-pub).

Therefore, the present inventors have undertaken efforts to develop inventions in which CSF drainage through the cribriform plate is enhanced. It is believed that enhancing CSF drainage through the cribriform plate will beneficially lower intracranial pressure (ICP) and thereby provide physiological benefit to the TBI patient.

The present inventors further believe that drainage through the cribriform plate can be enhanced by increasing the pumping activity of the lymphatic tissue present in the olfactory and nasal mucosa.

Therefore, in accordance with the present invention, there is provided a method of reducing intracranial pressure in a patient having a raised intracranial pressure comprising the steps of:

a) intranasally applying a therapeutic agent to an intranasal lymphatic vessel of the patient to increase lymphatic circulation.

In accordance with some embodiments of the present invention, there is provided a method of reducing intracranial pressure in a patient having a raised intracranial pressure (such as occurs in traumatic brain injury), comprising the steps of:

-   -   a) applying a formulation to intranasal lymphatic tissue in an         amount effective to increase lymphatic circulation.

In accordance with some embodiments of the present invention, there is provided a method of treating a patient having a raised intracranial pressure, comprising:

-   -   a) irradiating a nasal lymphatic tissue of the patient with an         effective amount of red light to increase lymphatic circulation.

DESCRIPTION OF THE FIGURES

FIG. 1 discloses a cross-sectional side view of the nasal cavity, wherein the cribriform plate is a wafer-thin ledge of porous bony tissue.

FIG. 2 discloses a coronal view of the cribriform plate.

FIG. 3 discloses a frontal cross-section of the skull.

FIGS. 4 a-4 c disclose side, front and upper views of a red light emitting intranasal device of the present invention.

DETAILED DECSRIPTION OF THE INVENTION

Now referring to FIG. 1, the cribriform plate CP is a wafer-thin ledge of porous bony tissue located beneath the prefrontal cortex portion of the brain and above the nasal cavity. The porosity of the cribriform plate is filled with olfactory nerves extending from the olfactory bulb OB (located at the lower base of the brain) and terminating within the nasal mucosa. As shown here, the cribriform plate has a thickness of about 1 mm while the olfactory bulb has a thickness of about 3 mm. Thus , red light will traverse 1 mm of nerve fiber tissue within the cribriform plate and 3 mm of grey matter associated with the olfactory bulb, totaling to about 4 mm.

Now referring to FIG. 2, the coronal view of the cribriform plate CP reveals that fairly large throughholes extend transversely through about one-half of the cribriform plate. These throughholes comprises about 50 areal % of the cribriform plate.

Now referring to FIG. 3, this frontal cross-section shows that the thickness cribriform plate and the olfactory bulb comprise only about two mm.

In some embodiments, lymphatic circulation (“the pump flow index”) is increased by applying to the olfactory mucosa an effective amount of a compound selected from the group consisting of an NO antagonist, arachidonic acid and an anti-oxidant.

The present inventors have further noted that the literature is replete with references to the negative effect of nitric oxide (NO) on lymphatic vessel pumping rate. Von der Weid, Am. J. Physiol. Heart Circ. Physiol. 2001 June: 280(6) H2707-16 reports data consistent with the hypothesis that NO inhibits lymphatic vasoconstriction primarily by production of cGMP and activation of both cGMP- and cAMP-dependent protein kinases.

It appears that inhibition of the constitutive expression of endothelial NO synthase (eNOS) effectively increases lymphatic pumping activity. Therefore, in some embodiments, the formulation applied to the nasal lymphatics includes an inhibitor of the constitutive expression of endothelial NO synthase. In some embodiments, the inhibitor is L-NAME. Shirasawa, Am. J. Physiol. Gastrointest. Liver Physiol. 278: G551-G556, 2000 reports that a 15 minutes superfusion of 30 uM L-NAME into the mesenteries caused a significant ˜40% increase in lymphatic pump flow index.

In some embodiments, the formulation includes an NO scavenger, such as piperazine.

In some embodiments, the formulation includes a nitrone radical scavenger, such as 2-sulfo-phenyl-N-tert-butyl nitrone (S-PBN)

It appears that inducible NOS (iNOS) does not play a role in lymphatic circulation. Louin Neuropharmacology, 2006, February 50(2) 182-90 reports that selective inhibition of inducible nitric oxide did not reduce cerebral edema following TBI.

The present inventors have further noted that the literature contains references to the negative effect of reactive oxygen species on lymphatic vessel pumping rate. Zawieja, Lymphology, 1993, Sep. 26(3) 135-42 reports upon the intense inhibition of the active lymph pump in rat mesenteric lymphatics by hydrogen peroxide. Accordingly, in some embodiments of the present invention, anti-oxidants are applied to the intranasal lymphatic vessels.

In some embodiments, the anti-oxidant is a Vitamin, wherein the Vitamin is selected from the group consisting of Vitamin A, Vitamin C and Vitamin E.

In some embodiments, the anti-oxidant is lipohilic. Preferred lipophilic anti-oxidants include retinol, lycopene, alpha-carotene, beta-carotene, alpha-tocophenol, and gamma-tocophenol.

In some embodiments, the vasoconstrictor, NO antagonist or anti-oxidant can be combined with a mucoadhesive to enhance its contact with the nasal mucosa. In some embodiments, the mucoadhesive is selected from the group consisting of a hydrophilic polymer, a hydrogel and a thermoplastic polymer. Preferred hydrophilic polymers include cellulose-based polymers (such as methylcellulose, hydroxyethyl cellulose, hydroxy propyl methyl cellulose, sodium carboxy methyl cellulose, a carbomer chitosan and plant gum.

In some embodiments, the mucoadhesive is a water-soluble high molecular weight cellulose polymer. High molecular weight cellulose polymer refers to a cellulose polymer having an average molecular weight of at least about 25,000, preferably at least about 65,000, and more preferably at least about 85,000. The exact molecular weight cellulose polymer used will generally depend upon the desired release profile. For example, polymers having an average molecular weight of about 25,000 are useful in a controlled-release composition having a time release period of up to about 8 hours, while polymers having an average molecular weight of about 85,000 are useful in a controlled-release composition having a time released period of up to about 18 hours. Even higher molecular weight cellulose polymers are contemplated for use in compositions having longer release periods. For example, polymers having an average molecular weight of 180,000 or higher are useful in a controlled-release composition having a time release period of 20 hours or longer.

The controlled-release carrier layer preferably consists of a water-soluble cellulose polymer, preferably a high molecular weight cellulose polymer, selected from the group consisting of hydroxypropyl methyl cellulose (HPMC), hydroxyethyl cellulose (HEC), hydroxypropyl cellulose (HPC), carboxy methyl cellulose (CMC), and mixtures thereof. Of these, the most preferred water-soluble cellulose polymer is HPMC. Preferably the HPMC is a high molecular weight HPMC, with the specific molecular weight selected to provide the desired release profile.

The HPMC is preferably a high molecular weight HPMC, having an average molecular weight of at least about 25,000, more preferably at least about 65,000 and most preferably at least about 85,000. The HPMC preferably consists of fine particulates having a particle size such that not less than 80% of the HPMC particles pass through an 80 mesh screen. The HPMC can be included in an amount of from about 4 wt % to about 24 wt %, preferably from about 6 wt % to about 16 wt % and more preferably from about 8 wt % to about 12 wt %, based upon total weight of the composition.

Hydrogels can also be used to deliver the vasoconstrictor, NO antagonist or anti-oxidant to the olfactory mucosa. A “hydrogel” is a substance formed when an organic polymer (natural or synthetic) is set or solidified to create a three- dimensional open-lattice structure that entraps molecules of water or other solution to form a gel. The solidification can occur, e.g., by aggregation, coagulation, hydrophobic interactions, or cross-linking. The hydrogels employed in this invention rapidly solidify to keep the vasoconstrictor, NO antagonist or anti-oxidant at the application site, thereby eliminating undesired migration from the site. The hydrogels are also biocompatible, e.g., not toxic, to cells suspended in the hydrogel. A “hydrogel-inducer composition” is a suspension of a hydrogel containing desired the vasoconstrictor, NO antagonist or anti-oxidant . The hydrogel-inducer composition forms a uniform distribution of inducer with a well-defined and precisely controllable density. Moreover, the hydrogel can support very large densities of inducers. In addition, the hydrogel allows diffusion of nutrients and waste products to, and away from, the inducer, which promotes tissue growth.

Hydrogels suitable for use in the present invention include water-containing gels, i.e., polymers characterized by hydrophilicity and insolubility in water. See, for instance, “Hydrogels”, pages 458-459 in Concise Encyclopedia of Polymer Science and Engineering, Eds. Mark et al., Wiley and Sons, 1990, the disclosure of which is incorporated herein by reference.

In a preferred embodiment, the hydrogel is a fine, powdery synthetic hydrogel. Suitable hydrogels exhibit an optimal combination of such properties as compatibility with the matrix polymer of choice, and biocompatability. The hydrogel can include any of the following: polysaccharides, proteins, polyphosphazenes, poly(oxyethylene)-poly(oxypropylene) block polymers, poly(oxyethylene)-poly(oxypropylene) block polymers of ethylene diamine, poly(acrylic acids), poly(methacrylic acids), copolymers of acrylic acid and methacrylic acid, poly(vinyl acetate), and sulfonated polymers. Other preferred hydrogels include poly(acrylic acid co acrylamide) copolymer, carrageenan, sodium alginate, guar gum and modified guar gum.

In general, these polymers are at least partially soluble in aqueous solutions, e.g., water, or aqueous alcohol solutions that have charged side groups, or a monovalent ionic salt thereof. There are many examples of polymers with acidic side groups that can be reacted with cations, e.g., poly(phosphazenes), poly(acrylic acids), and poly(methacrylic acids). Examples of acidic groups include carboxylic acid groups, sulfonic acid groups, and halogenated (preferably fluorinated) alcohol groups. Examples of polymers with basic side groups that can react with anions are poly(vinyl amines), poly(vinyl pyridine), and poly(vinyl imidazole).

Preferred thermoplastic polmers include PVA, polyamide, polycarbonate, polyalkylene glycol, polyvinyl ether, polyvinyl ether, and polyvinyl halides, polymethacrylic acid, polymethylmethacrylic acid, methyl cellulose, hydroxypropyl cellulose, hydroxypropyl methylcellulose, and sodium carboxymethylcellulose, ethylene glycol copolymers,

Other polymers that may be suitable for use as a mucoadhesive include aliphatic polyesters, poly(amino acids), copoly(ether-esters), polyalkylenes oxalates, polyamides, tyrosine derived polycarbonates, poly(iminocarbonates), polyorthoesters, polyoxaesters, polyamidoesters, polyoxaesters containing amine groups, poly(anhydrides), polyphosphazenes, biomolecules (i.e., biopolymers such as collagen, elastin, bioabsorbable starches, etc.) and blends thereof For the purpose of this invention aliphatic polyesters include, but are not limited to, homopolymers and copolymers of lactide (which includes lactic acid, D-,L- and meso lactide), glycolide (including glycolic acid), ε-caprolactone, p-dioxanone (1,4-dioxan-2-one), trimethylene carbonate (1,3-dioxan-2-one), alkyl derivatives of trimethylene carbonate, δ-valerolactone, β- butyrolactone, χ-butyrolactone, ε-decalactone, hydroxybutyrate, hydroxyvalerate, 1,4- dioxepan-2-one (including its dimer 1,5,8,12-tetraoxacyclotetradecane-7,14-dione), 1,5- dioxepan-2-one, 6,6-dimethyl-1,4-dioxan-2-one, 2,5-diketomorpholine, pivalolactone, χ,χ-diethylpropiolactone, ethylene carbonate, ethylene oxalate, 3-methyl-1,4-dioxane-2,5-dione, 3,3-diethyl-1,4-dioxan-2,5-dione, 6,8-dioxabicycloctane-7-one and polymer blends thereof. Poly(iminocarbonates), for the purpose of this invention, are understood to include those polymers as described by Kemnitzer and Kohn, in the Handbook of Biodegradable Polymers, edited by Domb, et. al., Hardwood Academic Press, pp. 251-272 (1997). Copoly(ether-esters), for the purpose of this invention, are understood to include those copolyester-ethers as described in the Journal of Biomaterials Research, Vol. 22, pages 993-1009, 1988 by Cohn and Younes, and in Polymer Preprints (ACS Division of Polymer Chemistry), Vol. 30(1), page 498, 1989 by Cohn (e.g. PEO/PLA). Polyalkylene oxalates, for the purpose of this invention, include those described in U.S. Pat. Nos. 4,208,511; 4,141,087; 4,130,639; 4,140,678; 4,105,034; and 4,205,399. Polyphosphazenes, co-, ter- and higher order mixed monomer-based polymers made from L-lactide, D,L-lactide, lactic acid, glycolide, glycolic acid, para-dioxanone, trimethylene carbonate and ε-caprolactone such as are described by Allcock in The Encyclopedia of Polymer Science, Vol. 13, pages 31-41, Wiley Intersciences, John Wiley & Sons, 1988 and by Vandorpe, et al in the Handbook of Biodegradable Polymers, edited by Domb, et al, Hardwood Academic Press, pp. 161-182 (1997). Polyanhydrides include those derived from diacids of the form HOOC—C₆H₄ —O—(CH₂)_(m)—O—C₆H₄—COOH, where m is an integer in the range of from 2 to 8, and copolymers thereof with aliphatic alpha-omega diacids of up to 12 carbons. Polyoxaesters, polyoxaamides and polyoxaesters containing amines and/or amido groups are described in one or more of the following U.S. Pat. Nos. 5,464,929; 5,595,751; 5,597,579; 5,607,687; 5,618,552; 5,620,698; 5,645,850; 5,648,088; 5,698,213; 5,700,583; and 5,859,150. Polyorthoesters such as those described by Heller in Handbook of Biodegradable Polymers, edited by Domb, et al, Hardwood Academic Press, pp. 99-118 (1997).

In some embodiments, the mucoadhseive is selected from the group consisting of poly(lactic acid) (“PLA”) and poly(glycolic acid)(“PGA”), and copolymers thereof.

In some embodiments, the mucoadhesive formulation includes a penetration enhancer such as sodium glycocholate, sodium taurocholate, L-lysophosphotidyl choline, DMSO and a protease inhibitor.

For delivery, there is provided a standard nose drops squeezable spray container with a long thin semi-flexible tube attached to the distal end. The outer diameter of the tube is less than a millimeter, preferably less than 0.5 mm, more preferably less than 0.25 mm. The exit hole of the tube is preferably located on the peripheral wall near the distal end of the tube so that spray exiting it can be directed upwards. There is a marker on the container that indicates when the exit hole is oriented upwards towards the cribriform plate.

Therefore, in accordance with the present invention, there is provided an intranasal spray device for increasing intranasal lymphatic flow,

-   -   a) a hollow container having a first opening,     -   b) a flexible tube having a throughbore, a side surface having a         second opening, a proximal end having a third opening, and a         distal end having an end surface,     -   c) a formulation comprising a therapeutic agent contained within         the container,         wherein the third opening of the proximal end of the tube is in         fluid connection with the first opening of the hollow container,         and         wherein the therapeutic agent is selected from the group         consisting of an NO antagonist and an anti-oxidant.

The user directs the tube towards the medial wall of the nostril and points upwards so as to direct it medial to and over the middle nasal concha. The length of the tube is predetermined so that when the user has the shoulder of the container flush against the nostril the hole is adjacent the cribriform plate.

If there is concern about the safety of inserting a tube through a nasal passage, then the tube can also be balloon-like, so that it expands to full length upon being pressurized.

It appears that the action of the NO antagonist requires continuous infusion, and so placing the NO antagonist in a sustained release device provides such continuous delivery. Conversely, the action of the NO antagonist can be controlled by simply rinsing out the nasal cavity with water, thereby removing the sustained release of the NO antagonist.

The efficacy of the NO antagonist can be monitored by monitoring intracranial pressure.

In preferred embodiments, the formulation is applied to the olfactory mucosa. In preferred embodiments, the formulation is applied to the lymphatics located in the submucosa of the olfactory epithelium (olfactory turbinates). In preferred embodiments, the formulation is applied to the lymphatics that encircle the olfactory nerve trunks on the extracranial surface of the cribriform plate.

It is further believed that irradiation of intranasal lymphatic tissue with an effective amount of red light with also increase lymphatic circulation.

Therefore, in accordance with the present invention, there is provided a method of treating a patient having a raised intracranial pressure, comprising:

-   -   a) irradiating a nasal lymphatic tissue of the patient with an         effective amount of red light to increase lymphatic circulation.

It has been reported in the literature that red light irradiation of cells increases anti-oxidant activity and strongly deceases eNOS production. For example, Leung, Laser Surg. Med. 31:283-288 (2002), investigated the effect of low energy red laser after stroke in rats, and found that red light can both suppress eNO synthase activity. In particular, Leung found that irradiating a portion of the rat's brain with a 660 nm red light (average power 8.8 mW, 2.64 J/cm²) reduced eNOS activity up to about 85% over that in unirradiated stroke rats, and up to about 60% over the NOS activity in normal rats. See FIG. 3 of Leung. Leung concluded that the main findings of the study was that low energy laser may be protective by suppressing the activity of NOS.

Therefore, it is reasonable to believe that red light will effect an increase in lymphatic pump activity through these same mechanisms. In fact, U.S. Pat. No. 5,640,978 (“Wong”) reports_using red light laser energy to increase lymphatic circulation.

Moreover, red light may further enhance the pumping rate by decreasing the pro-oxidant activity in lymphatic vessels. According to Kamanli, Cell Biochem. Func. 2004, 22:53-57, catalase detoxifies hydrogen peroxide and converts lipid hydroperoxides into non-toxic alcohols, and is essential for the inhibition of inflammation related to the function of neutrophils. Romm, Biull. Eksp. Biol. Med. 1986 October 102(10) 426-8 reports that laser irradiation of wounds results in a decreased chemiluminescence that is attributable to activation of catalase in the tissue fluid.

Therefore, it is believed that irradiating the TBI nasal passage with an effective amount of red light will therapeutically increase of the activity of catalase in the irradiated region, thereby attenuating the deleterious effect of hydrogen peroxide upon the pumping activity in lymphatic tissue in the TBI patient.

Similarly, according to Kamanli, supra, SOD catalyses dismutation of the superoxide anion into hydrogen peroxide. The literature repeatedly reports that red light irradiation of inactivated SOD increases its activity. For example, Vladimirov, Biochemistry (Moscow) 69(1) 2004, 81-90 provides a review including the photoreactivation of Cu—Zn SOD under He—Ne laser. Karu, Laser Ther. 1993, 5, 103-9 reports that reactive oxygen species in human blood were found to be suppressed after laser diode illumination at 660 nm, 820 nm, 880 nm and 950 nm. This affect has been attributed by other authors to the activation of SOD or catalase. Volotovskaia Vopr Kurortol Zizioter Lech Fiz Kult 2003 May-June(3)22-5 reports that 632 nm He—Ne laser irradiation of blood has an anti-oxidant effect as shown by activation of SOD. Ostrakhovich Vestn Ross Akad Med Nauk. 2001(5) 23-7 reports that infrared pulse laser therapy of RA patients caused an increase in SOD activity. Gorbatenkova Biofizika, 1988 July-August 33(4) 717-9 reports that SOD that was inactivated by hydrogen peroxide was reactivated by a 450-680 nm red light laser. Vladimirov, Free Rad. Biol. Med. 1988, 5(5-6) 281-6 reports the inactivation of SOD by its incubation in a low pH 5.9 solution and its subsequent reactivation by helium-neon laser light. Catalase was found to be reactivated as well. Cho, In Vivo, 2004, September-October 18(5) 585-91 reports on the use of low level laser therapy (LLLT) to treat knee joints that have been induced with OA by injection of hydrogen peroxide. SOD was reported to increase about 40% in the OA group as compared to controls.

Therefore, it is believed that irradiating the TBI nasal passage with an effective amount of red light will therapeutically increase of the activity of SOD in the irradiated region, thereby attenuating the deleterious effect of superoxide anion upon the pumping activity in lymphatic tissue in the TBI patient.

Preferably, the red light of the present invention has a wavelength of between about 650 nm and about 1000 nm. In some embodiments, the wavelength of light is between 800 and 900 nm, more preferably between 800 nm and 835 nm. In this range, red light has a large penetration depth, thereby facilitating its transfer to the tissue. In some embodiments, the light source is situated to irradiate adjacent tissue with between about 0.02 J/cm² and 200 J/cm² energy. Without wishing to be tied to a theory, it is believed that light transmission in this energy range will be sufficient to increase the activity of the cytochrome oxidase and anti-oxidant activity around and in the lymphatic tissue. In some embodiments, the light source is situated to irradiate target tissue with more than 10 J/cm², and preferably about 100 J/cm² energy. In some embodiments, the light source is situated to irradiate adjacent tissue with between about 0.2 J/cm² and 50 J/cm² energy, more preferably between about 1 J/cm² and 10 J/cm² energy.

In some embodiments, the light source is situated to produce an energy intensity of between 0.1 watts/cm² and 10 watts/cm². In some embodiments, the light source is situated to produce about 1 milliwatt/cm². Therefore, in some embodiments of the present invention, the therapeutic dose of red light is provided to the TBI patient on approximately a daily basis, preferably no more than 3 times a day, more preferably no more than twice a day, more preferably once a day.

In some embodiments, the red light irradiation is delivered in a continuous manner. In others, the red light irradiation is pulsed in order to reduce the heat associated with the irradiation. Without wishing to be tied to a theory, it is believed that pulsed light may be more effective in achieving the vibratory oscillation of the catalase and SOD molecules.

Now referring to FIGS. 4 a-4 c, there is provided a probe 1 for treating a neurodegenerative disease in a patient, comprising:

-   -   a) a distal portion 3 adapted to fit within an upper portion of         a nasal cavity and having a red light emitter 5 oriented towards         the cribriform plate,     -   b) a flexible intermediate portion 7 having an angled, narrowed         portion 9,     -   c) a proximal portion 11 having a handgrip 13 having a knurled         surface 15 and a red light activation button 17,     -   d) a red light source (not shown),     -   e) a fiber optic cable (not shown) connecting the red light         source and the red light emitter.

In some embodiments, the height of the distal portion is greater than its width. This allows orientation. In some embodiments, the distal portion is detachable from the remainder of the device. This allows it to be periodically cleaned by the user. In some embodiments, the tip of the distal portion is rounded in order to ease the entry of the distal portion in the nasal passage. In some embodiments, the length of the distal portion corresponds substantially to the length of the cribriform plate. This allows the red light emitter to emit light along substantially the entire porosity of the cribriform plate. In some embodiments, the length of the red light emitter corresponds substantially to the length of the cribriform plate. In some embodiments, the red light emitter is oriented to face the cribriform plate upon insertion in the nasal passage. In some embodiments, the distal portion has an upper surface oriented to face the cribriform plate upon insertion. In some embodiments, the red light emitter emits light in an arc of less than 180 degrees. In some embodiments, the red light emitter emits light substantially lateral to the longitudinal axis of the proximal portion.

In some embodiments, the narrowed portion is provided along only one axis, thereby providing preferred bending.

In some embodiments, the red light source is located in the proximal portion. In some embodiments, the red light source is located in the distal portion. In some embodiments, the red light source is operated by a battery contained within the device. In some embodiments, the red light source is operated by an electric power cord connected to the device.

In some embodiments, a light reflective surface is provided around the red light emitter to concentrate the light.

Therefore, in accordance with the present invention, there is provided a probe for treating a neurodegenerative disease in a patient, comprising:

-   -   a) a distal portion adapted to fit within a portion of a nasal         cavity and having a red light emitter,     -   b) a proximal portion having a handgrip having a knurled surface         and a red light activation button, and     -   c) a red light source.

In some embodiments, the distal portion of the probe has a thickness of less than 1 mm, preferably less than 0.1 mm, in order to reduce irritation of the nasal cavity.

In some embodiments, the distal portion of the probe is a thin fiber optic cable that has reflective material dispersed therein so that light will disperse in all directions therefrom.

In some embodiments, prior to probe insertion, a pain-killer is sprayed into the nasal cavity so that the patient may more easily tolerate the insertion of the probe into the nasal cavity.

In preferred embodiments, the red light irradiates the olfactory mucosa with an effective amount of red light. In preferred embodiments, the red light irradiates the cribriform plate with an effective amount of red light. In preferred embodiments, the red light irradiates the lymphatics located in the submucosa of the olfactory epithelium (olfactory turbinates) with an effective amount of red light. In preferred embodiments, the red light irradiates the lymphatics that encircle the olfactory nerve trunks on the extracranial surface of the cribriform plate with an effective amount of red light.

In some embodiments, the irradiation is accomplished by inserting a red light emitting probe into the nasal cavity and activating the red light probe to emit red light. In some embodiments thereof, the red light emitting probe is placed adjacent the olfactory mucosa. In some embodiments thereof, the red light emitting probe is placed adjacent the lymphatics located in the submucosa of the olfactory epithelium (olfactory turbinates). In some embodiments thereof, the red light emitting probe is placed adjacent the lymphatics that encircle the olfactory nerve trunks on the extracranial surface of the cribriform plate

In some embodiments of the present invention, the patient having a raised intracranial pressure has a traumatic brain injury (TBI). In some embodiments of the present invention, the patient having a raised intracranial pressure has a stroke. In some embodiments of the present invention, the patient having a raised intracranial pressure has hydrocephalus. In some embodiments of the present invention, the patient having a raised intracranial pressure has Alzheimer's Disease (AD). 

1. A method of treating a patient having a raised intracranial pressure, comprising: a) irradiating a nasal lymphatic tissue of the patient with an amount of red light of between about 0.02 J/cm² and 200 J/cm² to increase lymphatic circulation.
 2. The method of claim 1 wherein the patient has hydrocephalus.
 3. The method of claim 1 wherein the patient has a stroke.
 4. The method of claim 1 wherein the patient has traumatic brain injury.
 5. The method of claim 1 wherein the irradiation is accomplished by inserting a red light emitting probe into a nasal cavity and activating the red light probe to emit red light.
 6. The method of claim 5 wherein the red light emitting probe is placed adjacent an olfactory mucosa.
 7. The method of claim 5 wherein the red light emitting probe is placed adjacent lymphatics located in a submucosa of an olfactory epithelium.
 8. The method of claim 5 wherein the red light emitting probe is placed adjacent lymphatics that encircle olfactory nerve trunks on an extracranial surface of a cribriform plate.
 9. The method of claim 1 wherein a pain-killer is sprayed into a nasal cavity of the patient prior to irradiation.
 10. The method of claim 1 wherein the amount of red light is between about 0.2 J/cm² and 50 J/cm².
 11. The method of claim 1 wherein the amount of red light is of between about 1 J/cm² and 10 J/cm². 